<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8">
    <title>测试提示框</title>

    <script src="../js/jquery.min.js"></script>
    <style type="text/css">
        .search
        {
            left: 0;
            position: relative;
        }
        #auto_div
        {
            display: none;
            width: 300px;
            border: 1px #74c0f9 solid;
            background: #FFF;
            position: absolute;
            top: 24px;
            left: 0;
            color: #323232;
        }
    </style>
    <!-- <script src="jquery-1.7.2.min.js" type="text/javascript"></script> -->
    <script type="text/javascript">
        //测试用的数据
        var test_list = ["小张", "小苏", "小杨", "老张", "老苏", "老杨", "老爷爷", "小妹妹", "老奶奶", "大鹏", "大明", "大鹏展翅", "你好", "hello", "hi"];
        var old_value = "";
        var currentSelIndex = -1;
        var oldSelIndex = -1;

        //自动完成
        function AutoComplete(auto, search, mylist, event) {
            if ($("#" + search).val() != old_value || old_value == "" 
                || event.keyCode == 40 || event.keyCode == 38 || event.keyCode == 13) {
                var autoNode = $("#" + auto);   //缓存对象（弹出框）
                var carlist = new Array();
                var n = 0;
                old_value = $("#" + search).val();

                for (i in mylist) {
                    if (mylist[i].indexOf(old_value) >= 0) {
                        carlist[n++] = mylist[i];
                    }
                }
                if (carlist.length == 0) {
                    autoNode.hide();
                    return;
                }
                autoNode.empty();  //清空上次的记录
                for (i in carlist) {
                    var wordNode = carlist[i];   //弹出框里的每一条内容

                    var newDivNode = $("<div>").attr("id", i);    //设置每个节点的id值
                    newDivNode.attr("style", "font:14px/25px arial;height:25px;padding:0 8px;cursor: pointer;");

                    newDivNode.html(wordNode).appendTo(autoNode);  //追加到弹出框

                    //鼠标移入高亮，移开不高亮
                    newDivNode.mouseover(function () {
                        if (currentSelIndex != -1) {        //原来高亮的节点要取消高亮（是-1就不需要了）
                            autoNode.children("div").eq(currentSelIndex).css("background-color", "white");
                        }
                        //记录新的高亮节点索引
                        currentSelIndex = $(this).attr("id");
                        $(this).css("background-color", "#ebebeb");
                    });
                    newDivNode.mouseout(function () {
                        $(this).css("background-color", "white");
                    });

                    //鼠标点击文字上屏
                    newDivNode.click(function () {
                        //取出高亮节点的文本内容
                        var comText = autoNode.hide().children("div").eq(currentSelIndex).text();
                        currentSelIndex = -1;
                        //文本框中的内容变成高亮节点的内容
                        $("#" + search).val(comText);
                    })
                    if (carlist.length > 0) {    //如果返回值有内容就显示出来
                        autoNode.show();
                    } else {               //服务器端无内容返回 那么隐藏弹出框
                        autoNode.hide();
                        //弹出框隐藏的同时，高亮节点索引值也变成-1
                        currentSelIndex = -1;
                    }
                }
                
             // 通过键盘上下键来进行选择，回车键进行确定
                var listLength = carlist.length;
                //currentSelIndex = currentSelIndex;
                if(event.keyCode == 40 || event.keyCode == 38){    
                    if(event.keyCode == 40 )    // 下移
                    {
                        if (currentSelIndex == listLength - 1) {
                            currentSelIndex = 0;
                        }
                        else {
                            currentSelIndex = currentSelIndex + 1;
                            if (currentSelIndex > listLength - 1) {
                                currentSelIndex = 0;
                            }
                        }
                    }
                    if(event.keyCode == 38 )    // 上移
                    {
                        if (currentSelIndex == -1) {
                            currentSelIndex = listLength - 1;
                        }
                        else {
                            currentSelIndex = currentSelIndex - 1;
                            if (currentSelIndex < 0) {
                                currentSelIndex = listLength - 1;
                            }
                        }
                    }
                    if (currentSelIndex != -1) {
                        autoNode.children("div").eq(currentSelIndex).css("background-color", "#4778DA");
                        selectedFlag = true;
                    }
                    if (oldSelIndex != -1) {
                        autoNode.children("div").eq(oldSelIndex).css("background-color", "#ffffff");
                    }
                }
                if(event.keyCode == 13)
                {
                    var comText = autoNode.hide().children("div").eq(currentSelIndex).text();
                    currentSelIndex = -1;
                    //文本框中的内容变成高亮节点的内容
                    $("#" + search).val(comText);
                    autoNode.hide();
                }
            }

            //点击页面隐藏自动补全提示框
            document.onclick = function (e) {
                var e = e ? e : window.event;
                var tar = e.srcElement || e.target;
                if (tar.id != search) {
                    if ($("#" + auto).is(":visible")) {
                        $("#" + auto).css("display", "none")
                    }
                }
            }
        }

        $(function () {
            old_value = $("#keyword").val();
            $("#keyword").focus(function (event) {
                if ($("#keyword").val() == "") {
                    AutoComplete("auto_div", "keyword", test_list, event);
                }
            });

            $("#keyword").keyup(function (event) {
                AutoComplete("auto_div", "keyword", test_list, event);
            });
        });
    </script>
</head>
<body>
    <div class="search">
        <input type="text" id="keyword" />
        <div id="auto_div"></div>
    </div>
</body>
</html>